Results 111 to 120 of about 5,545 (213)

Tracking the record of early life

Carnets de Géologie, 2005
Life may have been present on Earth from about 3.8 Ga or earlier. Based on a combination of geochemical, morphological and sedimentological evidence, the early biosphere included a wide diversity of prokaryotes exhibiting modern metabolisms that thrived ...
Marshall Craig P., Javaux Emmanuelle J.
doaj  

Graphitic Carbons and Biosignatures [PDF]

, 2014
The unambiguous identification of graphitic carbons as remains of life in ancient rocks is challenging because fossilized biogenic molecules are inevitably altered and degraded during diagenesis and metamorphism of the host rocks.
Papineau, D, Bernard, S
core  

Microbial Biosignatures in High-Iron Thermal Springs

, 2007
Debate exists regarding whether abiotic or biotic mechanisms were responsible for the oxidation of Fe2+ and the subsequent accumulation of ferric (Fe3+) iron assemblages in Precambrian Banded Iron Formations (BIFs).
Parenteau, Mary Nichole
core   +1 more source

Editorial: Terrestrial analogues of extraterrestrial environments: Assessing habitability and biosignatures preservation

Frontiers in Astronomy and Space Sciences, 2022
Jonathan Clarke, Margarita Safonova, Chandra Sivaram, Siddharth Pandey, Jennifer G. Blank   +4 more
doaj   +1 more source

Biosignatures in context

, 2016
International audienceBiological activity has changed the Earth environment on a global scale. One metabolism - oxygenic photosynthesis - is responsible for changing the face of the Earth by converting 0.1% of the solar flux received at the surface into ...
Selsis, Franck
core  

Editorial: Head & Neck Cancer and Esophageal Cancer: From Biosignatures to Therapeutics

Frontiers in Oncology, 2021
Victor C. Kok, Victor C. Kok, Cheng-Chia Yu, Cheng-Chia Yu, Jorge A.R. Salvador   +4 more
doaj   +1 more source

Vertical Transmission of Gut Dysbiosis From Mothers With Gestational Diabetes to Infants

Journal of Diabetes
Background Vertical transmission of microbes from a mother's gut to their offspring plays a crucial role in the genesis of the early life gut microbiome.
Jia Ming Low, Abhishek Gupta, Rachel Toh, Su Lin Lim, Shiao‐Yng Chan, Sanjay Swarup, Le Ye Lee   +6 more
doaj   +1 more source

Protein and transcriptional biomarker profiling may inform treatment strategies in lower respiratory tract infections by indicating bacterial–viral differentiation

Microbiology Spectrum
Lower respiratory tract infections (LRTIs) remain a significant global cause of infectious disease-related mortality. Accurate discrimination between acute bacterial and viral LRTIs is crucial for optimal patient care, prevention of unnecessary ...
Dhanasekaran Sivakumaran, Synne Jenum, Dagfinn Lunde Markussen, Sondre Serigstad, Aashish Srivastava, Christina Skår Saghaug, Elling Ulvestad, Siri Tandberg Knoop, Harleen M. S. Grewal   +8 more
doaj   +1 more source

The role of aluminium in the preservation of microbial biosignatures

, 2018
Demonstrating the biogenicity of presumptive microfossils in the geological record often requires supporting chemical signatures, including isotopic signatures.
Levett, Alan, Gagen, Emma J., Southam, Gordon, Vasconcelos, Paulo M., Guagliardo, Paul, Paz, Anat, Rintoul, Llew, Diao, Hui   +7 more
core   +1 more source

Biological, Equilibrium and Photochemical Signatures of C, N and S Isotopes in the Early Earth and Exoplanet Atmospheres

Life
The unambiguous detection of biosignatures in exoplanet atmospheres is a primary objective for astrobiologists and exoplanet astronomers. The primary methodology is the observation of combinations of gases considered unlikely to coexist in an atmosphere ...
James R. Lyons
doaj   +1 more source